Correct

下呼吸道

/ xià hūxīdào / 
Strokes

Example

As a Noun

lower respiratory tract

1
Xià
下
hūxīdào
呼吸道
hūxī
呼吸
kùnnan
困难

dyspnea of lower respiratory tract

2
Xià
下
hūxīdào
呼吸道
jíbìng
疾病

lower respiratory illness; lower respiratory tract illness

3
Xià
下
hūxīdào
呼吸道
gǎnrǎn
感染

lower respiratory infection (LRI); lower respiratory tract infection (LRTI)